Add support for most requested priority

Signed-off-by: Xiang Dai <long0dai@foxmail.com>

pkg/scheduler/plugins/nodeorder/nodeorder.go

@@ -42,14 +42,16 @@ const (
 	LeastRequestedWeight = "leastrequested.weight"
 	// BalancedResourceWeight is the key for providing Balanced Resource Priority Weight in YAML
 	BalancedResourceWeight = "balancedresource.weight"
+	// MostRequestedWeight is the key for providing Most Requested Priority Weight in YAML
+	MostRequestedWeight = "mostrequested.weight"
 )
 
 type nodeOrderPlugin struct {
 	// Arguments given for the plugin
 	pluginArguments framework.Arguments
 }
 
-//New function returns prioritizePlugin object
+// New function returns prioritize plugin object.
 func New(aruguments framework.Arguments) framework.Plugin {
 	return &nodeOrderPlugin{pluginArguments: aruguments}
 }
@@ -60,42 +62,52 @@ func (pp *nodeOrderPlugin) Name() string {
 
 type priorityWeight struct {
 	leastReqWeight          int
+	mostReqWeight           int
 	nodeAffinityWeight      int
 	podAffinityWeight       int
 	balancedRescourceWeight int
 }
 
+// calculateWeight from the provided arguments.
+//
+// Currently only supported priorities are nodeaffinity, podaffinity, leastrequested,
+// mostrequested, balancedresouce.
+//
+// User should specify priority weights in the config in this format:
+//
+//  actions: "reclaim, allocate, backfill, preempt"
+//  tiers:
+//  - plugins:
+//    - name: priority
+//    - name: gang
+//    - name: conformance
+//  - plugins:
+//    - name: drf
+//    - name: predicates
+//    - name: proportion
+//    - name: nodeorder
+//      arguments:
+//        leastrequested.weight: 2
+//        mostrequested.weight: 0
+//        nodeaffinity.weight: 2
+//        podaffinity.weight: 2
+//        balancedresource.weight: 2
 func calculateWeight(args framework.Arguments) priorityWeight {
-	/*
-	   User Should give priorityWeight in this format(nodeaffinity.weight, podaffinity.weight, leastrequested.weight, balancedresource.weight).
-	   Currently supported only for nodeaffinity, podaffinity, leastrequested, balancedresouce priorities.
-
-	   actions: "reclaim, allocate, backfill, preempt"
-	   tiers:
-	   - plugins:
-	     - name: priority
-	     - name: gang
-	     - name: conformance
-	   - plugins:
-	     - name: drf
-	     - name: predicates
-	     - name: proportion
-	     - name: nodeorder
-	       arguments:
-	         nodeaffinity.weight: 2
-	         podaffinity.weight: 2
-	         leastrequested.weight: 2
-	         balancedresource.weight: 2
-	*/
-
-	// Values are initialized to 1.
+
+	// Initial values for weights.
+	// By default, for backward compatibility and for reasonable scores,
+	// least requested priority is enabled and most requested priority is disabled.
 	weight := priorityWeight{
 		leastReqWeight:          1,
+		mostReqWeight:           0,
 		nodeAffinityWeight:      1,
 		podAffinityWeight:       1,
 		balancedRescourceWeight: 1,
 	}
 
+	// Checks whether mostrequested.weight is provided or not, if given, modifies the value in weight struct.
+	args.GetInt(&weight.mostReqWeight, MostRequestedWeight)
+
 	// Checks whether nodeaffinity.weight is provided or not, if given, modifies the value in weight struct.
 	args.GetInt(&weight.nodeAffinityWeight, NodeAffinityWeight)